Interdiffusion at Interfaces of Binary Polymer Mixtures with Different Molecular Weights
김운천, 박형석 · 1999
Interdiffusion between two partially miscible polymers of similar chemical structures with different molecular weights is characterized theoretically by using the reptation model for the interdiffusion. This model provides more reliable results than the early Rouse model for same molecular weights, compared with the experiments. Furthermore, by introducing the molecular weight ratio R into the reptation model, we can see the dynamic ef-fect of molecular weight on the diffusion behaviors of the asymmetric system. Near the critical point the diffu-sion behaviors of asymmetric binary polymer mixtures are well characterized by the interfacial width W(t), the mass transport M(t) for the different values of the Flory χ parameter and different molecular weight ratios of polymers of the diffusion couple. These two quantities and composition profiles by this model give better agreement with experiments.